They were arrested on charges of possession with intend to deliver marijuana within 1,000 feet of certain places, maintaining a drug house and possession of drug paraphernalia.

Police also reported confiscating U.S. currency, packing materials and scales.

Janesville police said the investigation is ongoing. No other details were available Friday night.

Two men from Clinton and a man from Illinois were arrested last December and charged with receiving about two pounds of marijuana that was mailed from California.

Seizures of marijuana in the mail have increased in recent years, according to news reports.

An article in The Advocate of Baton Rouge, La., last month quoted a postal inspector who said the Postal Service's Express Mail was favored by some narcotics shippers because of its reliability, speed and relatively low cost.

“Drawn by the anonymity and affordability of the mail, dealers calculate that a high percentage of their crop will proceed unmolested among the more than 500 million pieces of mail processed every day,” the newspaper reported.